The old code used splice on a 2GB []byte when not in short mode, meaning
that running 'go test net' when one had 4GB or less free memory would
easily result in "out of memory" runtime panics.

Instead, use a much smaller size that is still big enough to not fit
into a single splice(2) syscall. The new size is just 5MB, so the test
uses a fraction of the memory it used to, and there's no longer a need
for a different size on short mode.

This also speeds up the test, which goes from ~1.23s to ~0.01s on my
laptop.

Fixes #26867.

Change-Id: Iae1daa5c0995b549f41992f44339be32ca1ee5e4
Reviewed-on: https://go-review.googlesource.com/128535
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Andrei Tudor Călin <mail@acln.ro>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

* TestAtomicCoverpkgAll -> Script/cover_atomic_pkgall.txt and make it
* non-short
* TestCoverpkgAllRuntime -> Script/cover_pkgall_runtime.txt and make it
* non-short
* TestCpuprofileTwice -> Script/cpu_profile_twice.txt and make it
* non-short
* TestGoTestMainTwice -> make it non-short

Updates #26472

Change-Id: I24f3d4c2a8b6e317adb369a1b1426e693f9571ed
Reviewed-on: https://go-review.googlesource.com/126636Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Before this change, 'go get <module>@none' for a module not in the build list
would add the module to go.mod (with the explicit version string "none").
Subsequent go commands would fail with 'invalid module version "none"'.

Change-Id: Iebcaeab89eb19959f0a9aeda836f179962953313
Reviewed-on: https://go-review.googlesource.com/127215Reviewed-by: Russ Cox <rsc@golang.org>

Change-Id: Ia2948a88c6d45a31be17b3d7415559cd53c289ce
Reviewed-on: https://go-review.googlesource.com/128015Reviewed-by: Russ Cox <rsc@golang.org>

A module like "gopkg.in/macaroon.v2" might have a test with a "_test" package
suffix (see https://golang.org/cmd/go/#hdr-Test_packages).
When we compile that test, its ImportStack entry includes the "_test" suffix
even though nothing else can actually import it via that path.
When we look up the module containing such a package, we must use the original
path, not the suffixed one.

On the other hand, an actual importable package may also be named with the
suffix "_test", so we need to be careful not to strip the suffix if it is
legitimately part of the path. We cannot distinguish that case by examining
srcDir or the ImportStack: the srcDir contaning a module doesn't necessarily
bear any relationship to its import path, and the ImportStack doesn't tell us
whether the suffix is part of the original path.

Fortunately, LoadImport usually has more information that we can use: it
receives a parent *Package that includes the original import path.

Fixes #26722

Change-Id: I1f7a4b37dbcb70e46af1caf9a496dfdd59ae8b17
Reviewed-on: https://go-review.googlesource.com/127796Reviewed-by: Russ Cox <rsc@golang.org>

Change-Id: I09532546c96b3758f76528fb5010dafc638139b8
Reviewed-on: https://go-review.googlesource.com/128135Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This commits adds []interface{} and map[string]interface{} as quick
ways to create JavaScript arrays and objects. They correspond to the
JavaScript notations [...] and {...}. A type alias can be used for
a concise notation.

Change-Id: I98bb08dbef1e0f3bd3d65c732d6b09e1520026ba
Reviewed-on: https://go-review.googlesource.com/126855Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The package arch didn't have a definition as you can see in https://tip.golang.org/pkg/cmd/asm/internal/arch/

Change-Id: I07653b396393a75c445d04dbae5e22e90a0d5133
GitHub-Last-Rev: a859e9410f38073853687b933f53eb6570af3216
GitHub-Pull-Request: golang/go#26817
Reviewed-on: https://go-review.googlesource.com/127929
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

Fixes #26721

Change-Id: Icc4660327a9ba668c88f8d9e0b9f206ba8f6dc27
Reviewed-on: https://go-review.googlesource.com/127975Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

GIT_TRACE write message to stderr, while run1 merge both stdout and
stderr. So function which call run1 and rely on its output will failed
to parse the result when run1 success.

By using cmd.Output(), we ensure only cmd standard out is returned.

Fixes #19682

Change-Id: I7002df17fe68aea1860ddc7382c68cc23548bd90
Reviewed-on: https://go-review.googlesource.com/126735Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

"expanded imports paths" should read "expanded import paths." Run
mkalldocs.sh to pick up other changes which were not committed to
alldocs.go.

Change-Id: Iaa61e022d65f9464e8ff93a92cfba27dadf679cf
Reviewed-on: https://go-review.googlesource.com/127157Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Reportedly on some new Fedora systems the linker is producing extra
load segments, basically making the dynamic section non-executable.
We were assuming that the first load segment could be used to
determine the program's load offset, but that is no longer true.
Use the first executable load segment instead.

Fixes #26369

Change-Id: I5ee31ddeef2e8caeed3112edc5149065a6448456
Reviewed-on: https://go-review.googlesource.com/127895
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #26507

Change-Id: I967e4f897ca891c70ca8bb0e66b984530c240815
Reviewed-on: https://go-review.googlesource.com/127835Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Rob Pike <r@golang.org>

Notify readers that interval notation is used.
Fixes: #26765

Change-Id: Id02a7fcffbf41699e85631badeee083f5d4b2201
Reviewed-on: https://go-review.googlesource.com/127549Reviewed-by: Rob Pike <r@golang.org>

Fixes #26792

Change-Id: I9a878180af28e3939b654fd88bed150010dffde0
Reviewed-on: https://go-review.googlesource.com/127856
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

gcWriteBarrier and wbBufFlush assume that not writing to an argument
variable is sufficient to not clobber the corresponding argument slot.
This assumption lets us simplify the write barrier assembly code,
speed up the flush path, and reduce the stack usage of the write
barrier.

But it is an assumption, so this CL documents it to make this clear.

Alternatively, we could separate the register spill slots from the
argument slots in the write barrier, but that loses the advantages
above. On the other hand, it's extremely unlikely that we'll change
the behavior of the compiler to start clobbering argument slots (if
anything, we'd probably change it to *not* clobber argument slots even
if you wrote to the arguments).

Fixes #25512.

Change-Id: Ib2cf29c0d90956ca02b997ef6e7fa56fc8044efe
Reviewed-on: https://go-review.googlesource.com/127815Reviewed-by: Cherry Zhang <cherryyz@google.com>

Updates #25289

Change-Id: I662760b921be625aca988cd0b43c648ac5dfd814
Reviewed-on: https://go-review.googlesource.com/127837Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

"BFI $0, R1, $7, R2" is expected to copy bit 0~6 from R1 to R2, and
left R2's other bits unchanged.

But the assembler rejects it with error "illegal bit number", and
BFIW/SBFIZ/SBFIZW/UBFIZ/UBFIZW have the same problem.

This CL fixes that issue and adds corresponding test cases.

fixes #26736

Change-Id: Ie0090a0faa38a49dd9b096a0f435987849800b76
Reviewed-on: https://go-review.googlesource.com/127159
Run-TryBot: Ben Shi <powerman1st@163.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

We were passing untrimmed paths to ModPackageModuleInfo, which was then failing
the build because it was asked to resolve an invalid path.

Fixes #26722

Change-Id: I043cc9c26f2188c5e005c0353620d9c55b339df9
Reviewed-on: https://go-review.googlesource.com/127795Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

This fixes tests on systems where ccache is the default compiler.

Also simplify a prior workaround for this fault.

Fixed #26789

Change-Id: I031ff0b65ace7fc5e284393298e004aa2ad3b6f5
Reviewed-on: https://go-review.googlesource.com/127775Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: I54e651a952afa8928cc0204ba37092d3b2347266
Reviewed-on: https://go-review.googlesource.com/127737
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Change-Id: I2256c850e071882b00c362da03abc8b021c1ec2a
Reviewed-on: https://go-review.googlesource.com/126015Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Test large but not infinite arguments.

This CL adds a test which breaks s390x.  Don't submit until
a fix for that is figured out.

Update #26477

Change-Id: Ic86739fe3554e87d7f8e15482875c198fcf1d59c
Reviewed-on: https://go-review.googlesource.com/125641
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

It breaks on the Darwin builders, with

--- FAIL: TestTestCacheInputs (21.65s)
    go_test.go:5371: file.txt: old=2018-08-02 15:12:21.136438 -0700 PDT m=+219.458659208, info.ModTime=2018-08-02 15:12:21 -0700 PDT
    go_test.go:5377: running testgo [test testcache]
    go_test.go:5377: standard output:
    go_test.go:5377: ok  	testcache	0.013s

    go_test.go:5378: running testgo [test testcache]
    go_test.go:5378: standard output:
    go_test.go:5378: ok  	testcache	(cached)

    go_test.go:5382: running testgo [test testcache]
    go_test.go:5382: standard output:
    go_test.go:5382: ok  	testcache	0.172s

    go_test.go:5384: running testgo [test testcache]
    go_test.go:5384: standard output:
    go_test.go:5384: ok  	testcache	(cached)

    go_test.go:5387: running testgo [test testcache -run=FileSize]
    go_test.go:5387: standard output:
    go_test.go:5387: ok  	testcache	0.012s

    go_test.go:5388: running testgo [test testcache -run=FileSize]
    go_test.go:5388: standard output:
    go_test.go:5388: ok  	testcache	(cached)

    go_test.go:5391: running testgo [test testcache -run=FileSize]
    go_test.go:5391: standard output:
    go_test.go:5391: ok  	testcache	0.008s

    go_test.go:5393: running testgo [test testcache -run=FileSize]
    go_test.go:5393: standard output:
    go_test.go:5393: ok  	testcache	(cached)

    go_test.go:5396: running testgo [test testcache -run=Chdir]
    go_test.go:5396: standard output:
    go_test.go:5396: ok  	testcache	0.417s

    go_test.go:5397: running testgo [test testcache -run=Chdir]
    go_test.go:5397: standard output:
    go_test.go:5397: ok  	testcache	(cached)

    go_test.go:5400: running testgo [test testcache -run=Chdir]
    go_test.go:5400: standard output:
    go_test.go:5400: ok  	testcache	(cached)

    go_test.go:5401: did not notice file size change
    go_test.go:5401: pattern \(cached\) found unexpectedly in standard output
FAIL

Original CL description:

    Evaluating the symlinks was slowing down test cache checks.

    Fixes #26562
    Fixes #26726

            ijt:~/gopath/src/issue26562$ cat foo_test.go
            package foo_test

            import (
                    "fmt"
                    "os"
                    "path/filepath"
                    "testing"
            )

            // package and imports snipped
            func TestCache(t *testing.T) {
                    tmp := os.TempDir()
                    for i := 0; i < 1000000; i++ {
                            os.Stat(filepath.Join(tmp, fmt.Sprintf("%d", i)))
                    }
            }
            ijt:~/gopath/src/issue26562$ time ~/github/go/bin/go test -count=1
            PASS
            ok      issue26562      9.444s

            real    0m10.021s
            user    0m2.344s
            sys     0m7.835s
            ijt:~/gopath/src/issue26562$ time ~/github/go/bin/go test .
            ok      issue26562      (cached)

            real    0m0.802s
            user    0m0.551s
            sys     0m0.306s

Updates #26562
Updates #26726

Change-Id: I7914ee57dc75bcbd7f0ea01c70bed97d67c810ea
Reviewed-on: https://go-review.googlesource.com/127715
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The existing implementation produces correct results with a wide range of inputs,
but invalid results asymptotically. With this change we ensure correct asymptotic results
on s390x

Fixes #26477

Change-Id: I760c1f8177f7cab2d7622ab9a926dfb1f8113b49
Reviewed-on: https://go-review.googlesource.com/127119Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

Change-Id: I4063d5ec4ac45561b94472b528583be564981912
Reviewed-on: https://go-review.googlesource.com/120144
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>

Evaluating the symlinks was slowing down test cache checks.

Fixes #26562
Fixes #26726

	ijt:~/gopath/src/issue26562$ cat foo_test.go
	package foo_test

	import (
		"fmt"
		"os"
		"path/filepath"
		"testing"
	)

	// package and imports snipped
	func TestCache(t *testing.T) {
		tmp := os.TempDir()
		for i := 0; i < 1000000; i++ {
			os.Stat(filepath.Join(tmp, fmt.Sprintf("%d", i)))
		}
	}
	ijt:~/gopath/src/issue26562$ time ~/github/go/bin/go test -count=1
	PASS
	ok      issue26562      9.444s

	real    0m10.021s
	user    0m2.344s
	sys     0m7.835s
	ijt:~/gopath/src/issue26562$ time ~/github/go/bin/go test .
	ok      issue26562      (cached)

	real    0m0.802s
	user    0m0.551s
	sys     0m0.306s

Change-Id: I3ce7f7b68bb5b9e802069f277e79e1ed3c162622
Reviewed-on: https://go-review.googlesource.com/127635
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

This file is clearly a script test, not a module definition, but it's in the
wrong directory to be run as one.

Fortunately, it passes with only minor modifications (changing “..” to “.”).

Change-Id: I66a544dfde82b8348108d2596c74e174157ae297
Reviewed-on: https://go-review.googlesource.com/127615
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

The relevant change was reverted in CL 127658.

Updates #26671

Change-Id: I0c555c8e18f4c7e289de56d3ef840d79cf0adac2
Reviewed-on: https://go-review.googlesource.com/127659Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Before CL 97795, when go/scanner saw a //line comment, it would clean
the path and, if the path was relative, prepend the directory from the
file name. This was not the best API because it meant that the
behavior changed based on whether the code was running on Windows or
not, and it meant that information from the //line directive was lost.
So in CL 97795, among other changes, go/scanner was changed to simply
return the filename given in the //line comment.

Unfortunately existing tools such as unparam and unconvert expected
the old behavior. In order to avoid breaking those tools, revert that
part of the change.

Fixes #26671

Change-Id: Ifa06542bd19cda9d682ac33766ab9080444ba050
Reviewed-on: https://go-review.googlesource.com/127658
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The interface between the wasm binary and wasm_exec.js is experimental
and likely to change in the future. Still, there are some early adopters
who experiment with non-web wasm runtimes. They can't use wasm_exec.js
and have to provide their own equivalent. Adding the Go version as a
custom wasm sections allows for them to support a stable Go version and
the latest devel at the same time.

Change-Id: I6d377bb0a0c33cb80e86dd15a34ddc9a70680227
Reviewed-on: https://go-review.googlesource.com/127597
Run-TryBot: Richard Musiol <neelance@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

They didn't even have public types, which made them pretty mysterious.

Give them types and reference the Decoder, which uses them.

Also, refer them qualified by their package name in the examples, as
we usually do in example*.go files, which usually use package foo_test
specifically so we can show the package names along with the symbols.

Change-Id: I50ebbbf43778c1627bfa526f8824f52c7953454f
Reviewed-on: https://go-review.googlesource.com/127663Reviewed-by: Bryan C. Mills <bcmills@google.com>

Change-Id: I23e5d87648a4091fb4f6616bf80aa6c800974900
Reviewed-on: https://go-review.googlesource.com/127662Reviewed-by: Bryan C. Mills <bcmills@google.com>

Change-Id: I612041d31c01d49135947796fe2a09db3e6894d4
Reviewed-on: https://go-review.googlesource.com/127657Reviewed-by: Ian Lance Taylor <iant@golang.org>

os used to panic (access out of bounds) if executablePath was left empty

Fixes #22529

Change-Id: Iead5e60a3b000dbde421a8e8612c3690340879ce
Reviewed-on: https://go-review.googlesource.com/127546
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #26758

Change-Id: If08bafc85c353dfbb546107b75c8c884ab9c88e4
Reviewed-on: https://go-review.googlesource.com/127475
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

Some combined store optimization was already implemented
in go-1.11, but there is no corresponding test cases.

Change-Id: Iebdad186e92047942e53a74f2c20b390922e1e9c
Reviewed-on: https://go-review.googlesource.com/122915
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Fixes #26730

Change-Id: I3396598282c814e75c0c4ef16f692dbe83d2935e
Reviewed-on: https://go-review.googlesource.com/127395
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

When using the compiled .wasm with misc/wasm/wasm_exec.js, we get an error message if the site prohibits eval() via the Content-Security-Policy header. This can be resolved by moving the callback helper code from src/syscall/js/callback.go to misc/wasm/wasm_exec.js.

Fixes #26748

Change-Id: I28f271b8a00631f4c66a1ac31305e85f20f9d420
GitHub-Last-Rev: a6a0268f38d36c198ca6b4ceb2e75cc8afec74eb
GitHub-Pull-Request: golang/go#26750
Reviewed-on: https://go-review.googlesource.com/127296Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

The cgo tool predefines some C types such as C.uint. Don't give an
error if the type that cgo defines does not match the type in a header file.

Fixes #26743

Change-Id: I9ed3b4c482b558d8ffa8bf61eb3209415b7a9e3c
Reviewed-on: https://go-review.googlesource.com/127356Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>